Disable overscroll on Windows machines w/o touchscreen

content/browser/frame_host/navigation_controller_impl.cc

Index: content/browser/frame_host/navigation_controller_impl.cc
diff --git a/content/browser/frame_host/navigation_controller_impl.cc b/content/browser/frame_host/navigation_controller_impl.cc
index 3b53e5844f1548ed984d2a1bfb7e6bc31a18fa66..d3b75b36ce83308f435fd89041dff8d12494d8bc 100644
--- a/content/browser/frame_host/navigation_controller_impl.cc
+++ b/content/browser/frame_host/navigation_controller_impl.cc
@@ -41,6 +41,8 @@
 #include "net/base/mime_util.h"
 #include "net/base/net_util.h"
 #include "skia/ext/platform_canvas.h"
+#include "ui/base/touch/touch_device.h"
+#include "ui/base/touch/touch_enabled.h"
 #include "url/url_constants.h"
 
 namespace content {
@@ -519,6 +521,23 @@ void NavigationControllerImpl::TakeScreenshot() {
   screenshot_manager_->TakeScreenshot();
 }
 
+bool NavigationControllerImpl::ShouldTakeScreenshotOnNavigation() {
+  if (!delegate_->CanOverscrollContent())
+    return false;
+
+  // Don't take screenshots on navigation on Windows and Unix machines unless
+  // they have a touch screen as these machines typically don't have a touchpad
+  // capable of horizontal scrolling. We are purposefully biased towards "no"
+  // here, so that we don't waste resources unnecessarily.
+#if defined(OS_BSD) || defined(OS_FREEBSD) || defined(OS_LINUX) \
+  || defined(OS_OPENBSD) || defined(OS_POSIX) || defined(OS_QNX) \
+  || defined(OS_WIN)
+  return ui::IsTouchDevicePresent() && ui::AreTouchEventsEnabled();
+#else
+  return true;
+#endif
+}
+
 void NavigationControllerImpl::SetScreenshotManager(
     NavigationEntryScreenshotManager* manager) {
   screenshot_manager_.reset(manager ? manager :